For ex pats (my step dad was English), he still received a small part pension from England. My mum had the hardest time contacting them after he passed to inform them to stop sending further payments. Hours on the phone being bounced around from one govt dept to another at odd hrs due to the time difference. Then finally when speaking to the right people in the right dept she was required to supply death certificate, marriage certificate & several other doc's all of which needed to be sent via post, not via computer (at 80 she couldn't really anyways), this all added to the time delays, stress etc. Then they tell her she'll be sent a final payment to assist with funeral costs etc into his bank account (he had a separate not linked old account remaining just for this pension payment as it was so hard to change anything), having passed away a few weeks earlier you can imagine to issues in receiving the funds. Long story short, if your getting payments from overseas make sure you have noted relevant contact details for them, if possible find out from them what happens on your passing, who can deal with them in your place, whats required in advance etc.
Yeah this is one of my biggest concerns as an expat. The last thing I want to do is put my family in a stressful situation after my death.